The Master has left standing orders requiring the OOW to be called if visibility falls below a stated distance. Visibility is currently deteriorating but has not yet reached that threshold. What should you do?

A. Wait exactly until the threshold is crossed before doing anything, since the standing order sets the only trigger for action

B. Standing orders set a minimum, not a ceiling, on when to call the Master — the OOW should exercise independent judgement throughout, and call earlier than the stated threshold if the developing situation (rate of deterioration, traffic, navigational hazards) warrants it, since standing orders cannot anticipate every situation

C. Standing orders override the OOW's own judgement entirely once issued

D. Ignore the standing order if the Master is asleep

A. The tidal height at the time of transit to confirm sufficient under-keel clearance

B. The yacht's fuel consumption for that leg

C. The colour of the seabed shown on the chart

D. Only the distance to the next waypoint

A. Switch the ECDIS to standby mode and navigate by GPS position alone

B. Ignore it — ECDIS alarms are frequently false and can be left running

C. Assess the situation against the planned route and charted depths, take action to maintain safe water, and inform the Master if there is any doubt

D. Acknowledge and silence the alarm immediately so it does not distract the helmsman